[WorldMaker]

Well, I made the wrong assumption in what was being asked then, I guess. I would presume the "left to right" rule is more generally assumed knowledge in C/C++ than postfix/prefix distinction of ++/-- which are pretty much the only unary operators with such a distinction in the language, whereas "left to right" is a rather underlying general rule and one in which you generally assume people are familiar with.

My apologies for answering the wrong question, but yes in that case the standard is also mostly clear that you can assume that things are evaluated from left to right in C/C++ and thus the first x in the line should be evaluated prior to the x++ later in the line...